Rokia Missaoui Lhouari Nourine Yoan Renaud Generating Positive and Negative Exact Rules Using Formal Concept Analysis: Problems and Solutions. 169-181 2008 ICFCA http://dx.doi.org/10.1007/978-3-540-78137-0_13 conf/icfca/2008 db/conf/icfca/icfca2008.html#MissaouiNR08